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Hex grid spatial utilities for offset coordinate systems. Use when working with hexagonal grids, calculating distances, finding neighbors, or spatial queries on hex maps.
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| name | hex-grid-spatial |
| description | Hex grid spatial utilities for offset coordinate systems. Use when working with hexagonal grids, calculating distances, finding neighbors, or spatial queries on hex maps. |
Utilities for hexagonal grid coordinate systems using odd-r offset coordinates (odd rows shifted right).
2 1
\ /
3 - * - 0
/ \
4 5
0=East, 1=NE, 2=NW, 3=West, 4=SW, 5=SE
def get_neighbors(x: int, y: int) -> List[Tuple[int, int]]:
"""Get all 6 neighboring hex coordinates."""
if y % 2 == 0: # even row
directions = [(1,0), (0,-1), (-1,-1), (-1,0), (-1,1), (0,1)]
else: # odd row - shifted right
directions = [(1,0), (1,-1), (0,-1), (-1,0), (0,1), (1,1)]
return [(x + dx, y + dy) for dx, dy in directions]
def hex_distance(x1: int, y1: int, x2: int, y2: int) -> int:
"""Calculate hex distance using cube coordinate conversion."""
def offset_to_cube(col, row):
cx = col - (row - (row & 1)) // 2
cz = row
cy = -cx - cz
return cx, cy, cz
cx1, cy1, cz1 = offset_to_cube(x1, y1)
cx2, cy2, cz2 = offset_to_cube(x2, y2)
return (abs(cx1-cx2) + abs(cy1-cy2) + abs(cz1-cz2)) // 2
def get_tiles_in_range(x: int, y: int, radius: int) -> List[Tuple[int, int]]:
"""Get all tiles within radius (excluding center)."""
tiles = []
for dx in range(-radius, radius + 1):
for dy in range(-radius, radius + 1):
nx, ny = x + dx, y + dy
if (nx, ny) != (x, y) and hex_distance(x, y, nx, ny) <= radius:
tiles.append((nx, ny))
return tiles
# Find neighbors of tile (21, 13)
neighbors = get_neighbors(21, 13)
# For odd row: [(22,13), (22,12), (21,12), (20,13), (21,14), (22,14)]
# Calculate distance
dist = hex_distance(21, 13, 24, 13) # Returns 3
# Check adjacency
is_adj = hex_distance(21, 13, 21, 14) == 1 # True
# Get all tiles within 3 of city center
workable = get_tiles_in_range(21, 13, 3)
The critical difference is in directions 1, 2, 4, 5 (the diagonal directions):
| Direction | Even Row (y%2==0) | Odd Row (y%2==1) |
|---|---|---|
| NE (1) | (0, -1) | (1, -1) |
| NW (2) | (-1, -1) | (0, -1) |
| SW (4) | (-1, +1) | (0, +1) |
| SE (5) | (0, +1) | (1, +1) |
East (0) and West (3) are always (1, 0) and (-1, 0).
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